LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034

B.Sc.

WS 22

DEGREE EXAMINATION –CHEMISTRY

FIFTH SEMESTER – APRIL 2007

CH 5400 – POLYMER CHEMISTRY

 

 

Date & Time: 30/04/2007 / 1:00 – 4:00         Dept. No.                                                     Max. : 100 Marks

 

 

PART-A                                               (10×2=20)

Answer all questions.

1. What are co-polymers? Give examples.
2. Write any two uses of the following.
3. a) Nylon     b) polyester
4. Draw the structure of isotactic polypropylene.
5. Define critical micellar concentration.
6. What is virgin polymer?
7. Give the structure of Teflon and mention its monomer and use.
8. Differentiate organic and inorganic polymers.
9. Compare bulk and solution polymerization.
10. What is nitrile polymer?
11. What are elastomers?

PART-B

Answer any eight questions.                                                                      (8X5=40)

11. Write short note on:
12. Addition polymerization
13. Condensation polymerization
14. Describe the process and reactions involved in vulcanization.
15. What are Photostabilizers? Explain their characteristics with example.
16. How are the following polymers and their monomers prepared?
17. i) Polyethylene        ii)  Buna-s
18. Explain the mechanism of alkali catalyzed polycondensation of phenol and

formaldehyde. Mention the uses of this polymer.

16. What is polymer degradation? Explain the different types of polymer degradation.
17. Write the preparation and uses of the following:
18. i) PET             ii) HDPE
19. Differentiate thermoplastics and thermosetting plastics.
20. Define cohesive energy and account for high cohesive energy of polyamide.
21. Explain the types of stereo regular polymer.
22. Write a note on ‘gas phase polymerization’.
23. What is compounding? Explain its importance.

 

 

 

 PART-C

Answer any four questions.

23. a) Explain the mechanism of free-radical polymerization with an example. (5)

b)Give an account of cationic polymerization.                                                  (5)

24. Discuss the different steps involved in emulsion polymerization. (10)
25. Write a note on fibre reinforced plastics. (10)

 

26. Write a note on:
27. Injection moulding
28. Blow moulding. (5+5)
29. What is Zeiglar-natta catalyst? Explain its advantages with mechanism. (10)
30. a) Explain the role of primary and secondary bond forces in polymers.         (6)
31. b) Give preparation, properties and uses of the following:
32. i) PVC ii) PUF                                                                   (2+2)

 

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